Annular optical component, lens module and electronic device

ABSTRACT

An annular optical component includes an inner surface, an outer surface, an object-side surface and an image-side surface. The inner surface includes multiple L-shaped annular grooves. The annular optical component includes multiple stripe-shaped structures disposed in the L-shaped annular grooves. The L-shaped annular grooves include an object-side L-shaped annular groove closest to the object-side surface and an image-side L-shaped annular groove closest to the image-side surface. A bottom diameter of the image-side L-shaped annular groove is larger than a bottom diameter of the object-side L-shaped annular groove. Each L-shaped annular groove includes a first side and a second side located between the object-side surface and the image-side surface. The stripe-shaped structures are disposed on the first side or the second side, and a degree of inclination between the first side and the central axis is larger than a degree of inclination between the second side and the central axis.

RELATED APPLICATIONS

This application claims priority to Taiwan Application 107107653, filedon Mar. 7, 2018, which is incorporated by reference herein in itsentirety.

BACKGROUND Technical Field

The present disclosure relates to an annular optical component, a lensmodule and an electronic device, more particularly to an annular opticalcomponent and a lens module applicable to an electronic device.

Description of Related Art

With the development of semiconductor manufacturing technology, theperformance of image sensors has been improved, and the pixel sizethereof has been scaled down. Therefore, featuring high image qualityhas been one of the indispensable features of an optical systemnowadays.

However, a conventional optical system does not have a proper capabilityof eliminating stray light. Thus, when powerful light rays are existedin the environment where an imaged object is located, unwanted lighttraveling into the optical system will be received by an image sensor,thereby resulting in halo effect at the periphery of the image.Specifically, the above-mentioned problems usually happen when the imageobject is located outdoors with sufficient amount of sunlight, or theimage object is located in a dim room where a high intensity lightsource is existed.

SUMMARY

According to one aspect of the present disclosure, an annular opticalcomponent includes an inner surface, an outer surface, an object-sidesurface and an image-side surface. The inner surface surrounds a centralaxis of the annular optical component, and the inner surface defines acentral aperture. The outer surface is opposite to the inner surface.The object-side surface faces toward an object side of the annularoptical component. The object-side surface is connected to the innersurface and the outer surface. The image-side surface faces toward animage side of the annular optical component. The image-side surface isconnected to the inner surface and the outer surface, and the image-sidesurface is opposite to the object-side surface. The inner surfaceincludes a plurality of L-shaped annular grooves. The annular opticalcomponent includes a plurality of stripe-shaped structures disposed inthe L-shaped annular grooves, and the stripe-shaped structures arearranged along a circumferential direction of the annular opticalcomponent. The L-shaped annular grooves include an object-side L-shapedannular groove closest to the object-side surface and an image-sideL-shaped annular groove closest to the image-side surface. A bottomdiameter of the image-side L-shaped annular groove is larger than abottom diameter of the object-side L-shaped annular groove. Each of theL-shaped annular grooves includes a first side and a second sideconnected to each other. The first side and the second side are locatedbetween the object-side surface and the image-side surface. Thestripe-shaped structures are disposed on either the first side or thesecond side, and a degree of inclination between the first side and thecentral axis is larger than a degree of inclination between the secondside and the central axis.

According to another aspect of the present disclosure, an annularoptical component includes an inner surface, an outer surface, anobject-side surface and an image-side surface. The inner surfacesurrounds a central axis of the annular optical component, and the innersurface defines a central aperture. The outer surface is opposite to theinner surface. The object-side surface faces toward an object side ofthe annular optical component. The object-side surface is connected tothe inner surface and the outer surface. The image-side surface facestoward an image side of the annular optical component. The image-sidesurface is connected to the inner surface and the outer surface, and theimage-side surface is opposite to the object-side surface. The innersurface includes at least one L-shaped annular groove. The annularoptical component includes a plurality of stripe and wedge-shapedstructures disposed in the L-shaped annular groove. The stripe andwedge-shaped structures are arranged along a circumferential directionof the annular optical component, and each of the stripe andwedge-shaped structures includes a tapered portion. The L-shaped annulargroove includes a first side and a second side connected to each other.The first side and the second side are located between the object-sidesurface and the image-side surface. The stripe and wedge-shapedstructures are disposed on the second side, and a degree of inclinationbetween the first side and the central axis is larger than a degree ofinclination between the second side and the central axis. The degree ofinclination between the second side and the central axis is α, and thefollowing condition is satisfied:

0 degree≤α≤15 degrees.

According to still another aspect of the present disclosure, a lensmodule includes one of the aforementioned annular optical component andan optical lens assembly. The annular optical component is disposed onthe optical lens assembly.

According to yet another aspect of the present disclosure, an electronicdevice includes the aforementioned lens module.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a perspective view of an annular optical component accordingto the 1st embodiment of the present disclosure;

FIG. 2 is a top view of the annular optical component in FIG. 1;

FIG. 3 is a side cross-sectional view of the annular optical componentin FIG. 1;

FIG. 4 and FIG. 5 are enlarged views of the annular optical component inFIG. 3;

FIG. 6 is an enlarged views of the annular optical component in FIG. 1;

FIG. 7 is a side cross-sectional view of an annular optical componentaccording to the 2nd embodiment of the present disclosure;

FIG. 8 and FIG. 9 are enlarged views of the annular optical component inFIG. 7;

FIG. 10 is a side cross-sectional view of an annular optical componentaccording to the 3rd embodiment of the present disclosure;

FIG. 11 and FIG. 12 are enlarged views of the annular optical componentin FIG. 10;

FIG. 13 is a side cross-sectional view of an annular optical componentaccording to the 4th embodiment of the present disclosure;

FIG. 14 and FIG. 15 are enlarged views of the annular optical componentin FIG. 13;

FIG. 16 is an enlarged view of an annular optical component according tothe 5th embodiment of the present disclosure;

FIG. 17 is an enlarged view of an annular optical component according tothe 6th embodiment of the present disclosure;

FIG. 18 is an enlarged view of an annular optical component according tothe 7th embodiment of the present disclosure;

FIG. 19 is an enlarged view of an annular optical component according tothe 8th embodiment of the present disclosure;

FIG. 20 is a schematic view of a lens module according to the 9thembodiment of the present disclosure;

FIG. 21 is a schematic view of a lens module according to the 10thembodiment of the present disclosure;

FIG. 22 is a perspective view of an image capturing unit according tothe 11th embodiment of the present disclosure;

FIG. 23 is a perspective view of an image capturing unit according toanother embodiment of the present disclosure;

FIG. 24 is a perspective view of an image capturing unit according tostill another embodiment of the present disclosure;

FIG. 25 is a perspective view of an electronic device according to the12th embodiment of the present disclosure;

FIG. 26 is another perspective view of the electronic device in FIG. 25;

FIG. 27 is a perspective view of an electronic device according toanother embodiment of the present disclosure; and

FIG. 28 is a perspective view of an electronic device according to stillanother embodiment of the present disclosure.

DETAILED DESCRIPTION

An annular optical component includes an inner surface, an outersurface, an object-side surface and an image-side surface. The innersurface surrounds a central axis of the annular optical component, andthe inner surface defines a central aperture. The outer surface isopposite to the inner surface. The object-side surface faces toward anobject side of the annular optical component, and the object-sidesurface is connected to the outer surface and the inner surface. Theimage-side surface faces toward an image side of the annular opticalcomponent, and the image-side surface is connected to the outer surfaceand the inner surface. The image-side surface is opposite to theobject-side surface. The inner surface includes at least one L-shapedannular groove, and the annular optical component includes a pluralityof stripe-shaped structures disposed in the L-shaped annular groove. Thestripe-shaped structures are arranged along a circumferential directionof the annular optical component. The L-shaped annular groove includes afirst side and a second side connected to each other. The first side andthe second side are located between the object-side surface and theimage-side surface. The stripe-shaped structures are disposed on eitherthe first side or the second side. A degree of inclination between thefirst side and the central axis is larger than a degree of inclinationbetween the second side and the central axis. The design of the L-shapedannular groove provides a space for accommodating the stripe-shapedstructures which are arranged along the circumferential direction of theannular optical component. The stripe-shaped structures improve thestructural strength of the annular optical component, and a lighttrapping structure is formed between every pair of two adjacentstripe-shaped structures. Therefore, the light trapping structures arefavorable for capturing unwanted light rays so as to prevent an imagefrom receiving stray light, thereby improving image quality.Furthermore, for the manufacture of annular optical component, theconfiguration of the annular optical component is favorable formodifying both the size and the shape of stripe-shaped structure so asto improve design flexibility, and thus the camera is applicable forvarious requirements.

The inner surface can include multiple L-shaped annular grooves, and thestripe-shaped structures are disposed on each of the L-shaped annulargrooves. When the inner surface includes multiple L-shaped annulargrooves, these L-shaped annular grooves includes an object-side L-shapedannular groove closest to the object-side surface and an image-sideL-shaped annular groove closest to the image-side surface, and a bottomdiameter of the image-side L-shaped annular groove is larger than abottom diameter of the object-side L-shaped annular groove. Therefore,it is favorable for improving light trapping efficiency of thestripe-shaped structures.

The annular optical component can include a main body and thestripe-shaped structures mentioned above. The main body includes theinner surface, the outer surface, the object-side surface and theimage-side surface. The main body can be integral with the stripe-shapedstructures. Therefore, it is favorable for manufacturing the annularoptical component by injection molding so as to reduce manufacturingcost.

When an angle between the first side and the second side of eachL-shaped annular groove is θ, the following condition can be satisfied:46 degrees<θ<136 degrees. Therefore, it is favorable for enhancing thedesign flexibility of a mold for manufacturing the annular opticalcomponent as well as maintaining a recognizable L-shaped annular groove.Preferably, the following condition can also be satisfied: 64degrees<θ<116 degrees.

When the inner surface includes multiple L-shaped annular grooves, theL-shaped annular grooves can be not overlapped (non-overlapped) witheach other in a direction parallel to the central axis. Therefore, it isfavorable for controlling the lift off of the annular optical component,which is manufactured by injection molding, so as to prevent unfavorablemold release problems.

When a thickness of the annular optical component is t, and a length ofeach of the stripe-shaped structures is d, the following condition canbe satisfied: 0.05<d/t<0.50. Therefore, during the manufacture ofannular optical component, it is favorable for preventing shapedistortion due to overly long stripe-shaped structure.

The number of the L-shaped annular groove can be two; that is, the innersurface includes only the object-side L-shaped annular groove closest tothe object-side surface and the image-side L-shaped annular grooveclosest to the image-side surface. When a length of each of thestripe-shaped structures disposed in the object-side L-shaped annulargroove is d1, and a length of each of the stripe-shaped structuresdisposed in the image-side L-shaped annular groove is d2, the followingcondition can be satisfied: 0.40<d1/d2<2.5. Therefore, it is favorablefor the annular optical component including proper number of L-shapedannular groove so as to reduce manufacturing time of the annular opticalcomponent, thereby improving manufacturing efficiency.

When a width of the first side of the L-shaped annular groove is L1, anda width of the second side of the L-shaped annular groove is L2, thefollowing condition can be satisfied: 0.45<L1/L2<2.5. Therefore, theconfiguration of the L-shaped annular groove is favorable for providinga better capability of capturing unwanted light rays; thus, whenreflected by the stripe-shaped structures, the unwanted light rays isprevented from escaping from the L-shaped annular groove. Preferably,the following condition can also be satisfied: 0.45<L1/L2<2.0.

When the degree of inclination between the second side and the centralaxis of the annular optical component is α, the following condition canbe satisfied: 0 degree≤α≤15 degrees. Therefore, it is favorable forenhancing lift off yield when molding the annular optical component aswell as maintaining the light receiving range of L-shaped annulargroove. Preferably, the following condition can also be satisfied: 0degree≤α≤8.0 degrees.

According to the present disclosure, each of the stripe-shapedstructures of the annular optical component can be a stripe andwedge-shaped structure. Therefore, it is favorable for obtaining aneasier molding process and enhancing molding yield.

According to the present disclosure, each of the stripe and wedge-shapedstructures can include a tapered portion. Therefore, it is favorable forforming a light trapping structure with a fine arrangement of the stripeand wedge-shaped structures.

According to the present disclosure, each of the tapered portions caninclude a smooth surface. Therefore, it is favorable for forming thelight trapping structure without surface roughening treatment so as tosimplify manufacturing processes.

According to the present disclosure, the stripe-shaped structures canhave even height. When a height of each of the stripe-shaped structuresis h, the following condition can be satisfied: 0.015 mm<h<0.23 mm.Therefore, a proper height of the stripe-shaped structure is favorablefor forming ideal light trapping structure so as to improve thecapability of blocking unwanted light rays. Preferably, the followingcondition can also be satisfied: 0.02 mm<h<0.12 mm.

According to the present disclosure, a cross section of the innersurface of the annular optical component is zigzag form. Therefore, itis favorable for forming a two dimensional and complicated lighttrapping structure so as to meet the requirements of night photographyand dark room photography, thereby improving image quality.

When the inner surface includes more than two L-shaped annular grooves,the bottom diameter of the object-side L-shaped annular groove, which isclosest to the object-side surface of the annular optical component, isφ1, the bottom diameter of the image-side L-shaped annular groove, whichis closest to the image-side surface of the annular optical component,is φ2, a diameter of the outer surface is φo, and a diameter of theinner surface is φi, the following condition can be satisfied:0.05<(φ2−φ1)/(φo−φi)<0.55. When the inner surface includes singleL-shaped annular groove, the bottom diameter of the L-shaped annulargroove is φg, the diameter of the outer surface is φo, and the diameterof the inner surface is φi, the following condition can be satisfied:0.5<(φo−φg)/(φg−φi)<10. Therefore, it is favorable for properlyarranging the positions of the L-shaped annular grooves so as to reduceflaws in the appearance of annular optical component caused by bendingand shrinkage during the injection molding, thereby improvingmanufacturing quality.

According to the present disclosure, a lens module includes theaforementioned annular optical component and an optical lens assembly.The annular optical component is disposed in the optical lens assembly.In some embodiments, the lens module can further include a barrelmember, a holding member or a combination thereof.

According to the present disclosure, the annular optical component caninclude an axial assembling structure, and the annular optical componentcan be disposed in the optical lens assembly by the axial assemblingstructure. The optical lens assembly includes a lens element adjacent tothe annular optical component, and the axial assembling structure isconfigured to align the central axis of the annular optical componentwith a center of the lens element. Therefore, it is favorable forimproving the coaxiality of the lens elements of the optical lensassembly so as to compensate unavoidable tolerances in the assemblingprocess.

According to the present disclosure, the annular optical component canbe a fixing ring configured to configured to determine the axialdistances between every two of lens elements of the optical lensassembly that are adjacent to each other. The central aperture of theannular optical component is configured to allow light to pass throughthe lens module, and only one of the object-side surface and theimage-side surface contacts the optical lens assembly. Therefore, it isfavorable for preventing the axial distances between every pair of twoadjacent lens elements from unpredictable changes due to the influenceof outside environment so as to improve the reliability of opticalperformance.

According to the present disclosure, the L-shaped annular groovebasically includes the first side and the second side which jointlyconsist the L-shaped profile. The connection of the first side and thesecond side can enclose with an acute angle or an obtuse angle;alternatively, the connection of the first side and the second side canbe a corner with radius or other geometric shapes.

According to the present disclosure, the tapered portion of the stripeand wedge-shaped structure can be substantially in a shape of isoscelestriangle, and a tip of the tapered portion is formed by the intersectionof two lateral sides.

According to the present disclosure, an opening of the L-shaped annulargroove is toward either the image-side surface, the central aperture, ora direction between the image-side surface and the central aperture.

According to the present disclosure, the aforementioned features andconditions can be utilized in numerous combinations so as to achievecorresponding effects.

According to the above description of the present disclosure, thefollowing specific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a perspective view of an annular optical component accordingto the 1st embodiment of the present disclosure. FIG. 2 is a top view ofthe annular optical component in FIG. 1. FIG. 3 is a sidecross-sectional view of the annular optical component in FIG. 1. In thisembodiment, an annular optical component includes a main body 11 and aplurality of stripe-shaped structures 12 which are integral with eachother.

The main body 11 includes an inner surface 111, an outer surface 112,anobject-side surface 113 and an image-side surface 114. The inner surface111 surrounds a central axis A of the annular optical component anddefines a central aperture 115. The outer surface 112 is opposite to theinner surface 111. The object-side surface 113 faces toward an objectside of the annular optical component and is connected to the outersurface 112 and the inner surface 111. The image-side surface 114 facestoward an image side of the annular optical component and is connectedto the outer surface 112 and the inner surface 111. The image-sidesurface 114 is opposite to the object-side surface 113. As shown in FIG.3, a cross section of the inner surface 111 of the annular opticalcomponent in side view is zigzag form.

FIG. 4 and FIG. 5 are enlarged views of the annular optical component inFIG. 3. FIG. 6 is an enlarged views of the annular optical component inFIG. 1. The inner surface 111 includes two L-shaped annular grooves1111. One of the two L-shaped annular grooves 1111 closer to theobject-side surface 113 is interpreted as an object-side L-shapedannular groove, and the other L-shaped annular groove 1111 closer to theimage-side surface 114 is interpreted as an image-side L-shaped annulargroove. The two L-shaped annular grooves 1111 are not overlapped witheach other in a direction parallel to the central axis A. Thestripe-shaped structures 12 are disposed in the L-shaped annular grooves1111,and the stripe-shaped structures 12 in each L-shaped annular groove1111 are arranged along a circumferential direction of the annularoptical component. In detail, each L-shaped annular groove 1111 includesa first side 1111 a and a second side 1111 b which are located betweenthe object-side surface 113 and the image-side surface 114. The firstside 1111 a and the second side 1111 b are connected to each other, andthe stripe-shaped structures 12 are disposed on the second side 1111 b.As shown in FIG. 6, an end of each stripe-shaped structure 12 contactsthe first side 1111 a of the L-shaped annular groove 1111,and the otherend of each stripe-shaped structure 12 faces toward the image side ofthe annular optical component.

Each of the stripe-shaped structures 12 is a stripe and wedge-shapedstructure including a tapered portion 121. The tapered portion 121includes a smooth surface. In detail, the size of the tapered portion121 is gradually decreased from a bottom 1211 closing the second side1111 b to a tip 1212 away from the second side 1111 b, and the taperedportion 121 includes two inclined surfaces 1213 which are smooth.

A bottom diameter φ2 of the image-side L-shaped annular groove (theL-shaped annular groove 1111 closer to the image-side surface 114) islarger than a bottom diameter φ1 of the object-side L-shaped annulargroove (the L-shaped annular groove 1111 closer to the object-sidesurface 113). A degree of inclination β between the first side 1111 aand the central axis A of the annular optical component is larger than adegree of inclination α between the second side 1111 b and the centralaxis A. FIG. 4 shows the angle a (degree of inclination) between areference line parallel to the second side 1111 b and the otherreference line parallel to the central axis A.

When an angle between the first side 1111 a and the second side 1111 bof each of the L-shaped annular grooves 1111 is θ, the followingcondition is satisfied: θ=93 degrees (deg.).

When a thickness of the annular optical component is t, and a length ofeach of the stripe-shaped structures 12 disposed in the object-sideL-shaped annular groove is d1, the following condition is satisfied:d1/t=0.30.

When the thickness of the annular optical component is t, and a lengthof each of the stripe-shaped structures 12 disposed in the image-sideL-shaped annular groove is d2, the following condition is satisfied:d2/t=0.35.

When the length of each of the stripe-shaped structures 12 disposed inthe object-side L-shaped annular groove is d1, and the length of each ofthe stripe-shaped structures 12 disposed in the image-side L-shapedannular groove is d2, the following condition is satisfied: d1/d2=0.85.

When a width of the first side 1111 a of the object-side L-shapedannular groove is L1, and a width of the second side 1111 b of theobject-side L-shaped annular groove is L2, the following condition issatisfied: L1/L2=1.36.

When a width of the first side 1111 a of the image-side L-shaped annulargroove is L1, and a width of the second side 1111 b of the image-sideL-shaped annular groove is L2, the following condition is satisfied:L1/L2=1.0.

When the degree of inclination between the second side 1111 b and thecentral axis A of the annular optical component is α, the followingcondition is satisfied: α=2.955 degrees.

The stripe-shaped structures 12 have even height. When a height of eachof the stripe-shaped structures 12 is h, the following condition issatisfied: h=0.04 millimeter (mm).

When the bottom diameter of the object-side L-shaped annular groove isφ1, the bottom diameter of the image-side L-shaped annular groove is φ2,a diameter of the outer surface 112 is φo, and a diameter of the innersurface 111 is φi, the following condition is satisfied:(φ2−φ1)/(φo−φi)=0.30.

2nd Embodiment

FIG. 7 is a side cross-sectional view of an annular optical componentaccording to the 2nd embodiment of the present disclosure. FIG. 8 andFIG. 9 are enlarged views of the annular optical component in FIG. 7. Inthis embodiment, an annular optical component includes a main body 21and a plurality of stripe-shaped structures 22 which are integral witheach other.

The main body 21 includes an inner surface 211, an outer surface 212, anobject-side surface 213 and an image-side surface 214. The inner surface211 surrounds a central axis A of the annular optical component anddefines a central aperture 215. The outer surface 212 is opposite to theinner surface 211. The object-side surface 213 faces toward an objectside of the annular optical component and is connected to the outersurface 212 and the inner surface 211. The image-side surface 214 facestoward an image side of the annular optical component an d is connectedto the outer surface 212 and the inner surface 211. The image-sidesurface 214 is opposite to the object-side surface 213. As shown in FIG.7, a cross section of the inner surface 211 of the annular opticalcomponent in side view is zigzag form.

The inner surface 211 includes two L-shaped annular grooves 2111. One ofthe two L-shaped annular grooves 2111 closer to the object-side surface213 is interpreted as an object-side L-shaped annular groove, and theother L-shaped annular groove 2111 closer to the image-side surface 214is interpreted as an image-side L-shaped annular groove. The twoL-shaped annular grooves 2111 are not overlapped with each other in adirection parallel to the central axis A. The stripe-shaped structures22 are disposed in the L-shaped annular grooves 2111, and thestripe-shaped structures 22 in each L-shaped annular groove 2111 arearranged along a circumferential direction of the annular opticalcomponent. In detail, each L-shaped annular groove 2111 includes a firstside 2111 a and a second side 2111 b which are located between theobject-side surface 213 and the image-side surface 214. The first side2111 a and the second side 2111 b are connected to each other, and thestripe-shaped structures 22 are disposed on the second side 2111 b. Anend of each stripe-shaped structure 22 contacts the first side 2111 a ofthe L-shaped annular groove 2111, and the other end of eachstripe-shaped structure 22 faces toward the image side of the annularoptical component. The stripe-shaped structure 22 has a shape similar tothe stripe-shaped structure 12 in the first embodiment, and thus detaildescription for the stripe-shaped structure 22 is omitted hereafter.

A bottom diameter φ2 of the image-side L-shaped annular groove (theL-shaped annular groove 2111 closer to the image-side surface 214) islarger than a bottom diameter φ1 of the object-side L-shaped annulargroove (the L-shaped annular groove 2111 closer to the object-sidesurface 213). A degree of inclination β between the first side 2111 aand the central axis A of the annular optical component is larger than adegree of inclination α between the second side 2111 b and the centralaxis A.

In the 2nd embodiment, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

2nd embodiment θ [deg.] 93.071 L1/L2 1.22 and 0.47 d1/t 0.21 α [deg.]3.025 d2/t 0.29 h [mm] 0.04 d1/d2 0.73 (φ2 − φ1)/(φo − φi) 0.26

3rd Embodiment

FIG. 10 is a side cross-sectional view of an annular optical componentaccording to the 3rd embodiment of the present disclosure. FIG. 11 andFIG. 12 are enlarged views of the annular optical component in FIG. 10.In this embodiment, an annular optical component includes a main body 31and a plurality of stripe-shaped structures 32 which are integral witheach other.

The main body 31 includes an inner surface 311, an outer surface 312, anobject-side surface 313 and an image-side surface 314. The inner surface311 surrounds a central axis A of the annular optical component anddefines a central aperture 315. The outer surface 312 is opposite to theinner surface 311. The object-side surface 313 faces toward an objectside of the annular optical component and is connected to the outersurface 312 and the inner surface 311. The image-side surface 314 facestoward an image side of the annular optical component and is connectedto the outer surface 312 and the inner surface 311. The image-sidesurface 314 is opposite to the object-side surface 313. As shown in FIG.10, a cross section of the inner surface 311 of the annular opticalcomponent in side view is zigzag form.

The inner surface 311 includes single L-shaped annular groove 3111. Thestripe-shaped structures 32 are disposed in the L-shaped annular groove3111, and the stripe-shaped structures 32 in the L-shaped annular groove3111 are arranged along a circumferential direction of the annularoptical component. In detail, the L-shaped annular groove 3111 includesa first side 3111 a and a second side 3111 b which are located betweenthe object-side surface 313 and the image-side surface 314. The firstside 3111 a and the second side 3111 b are connected to each other, andthe stripe-shaped structures 32 are disposed on the second side 3111 b.The stripe-shaped structure 32 has a shape similar to the stripe-shapedstructure 12 in the first embodiment, and thus detail description forthe stripe-shaped structure 32 is omitted hereafter. A degree ofinclination β between the first side 3111 a and the central axis A ofthe annular optical component is larger than a degree of inclination abetween the second side 3111 b and the central axis A.

When an angle between the first side 3111 a and the second side 3111 bof the L-shaped annular groove 3111 is θ, the following condition issatisfied: θ=93.071 degrees.

When a thickness of the annular optical component is t, and a length ofeach of the stripe-shaped structures 32 disposed in the L-shaped annulargroove 3111 is d, the following condition is satisfied: d/t=0.56.

When a width of the first side 3111 a of the L-shaped annular groove3111 is L1, and a width of the second side 3111 b of the L-shapedannular groove 3111 is L2, the following condition is satisfied:L1/L2=0.71.

When the degree of inclination between the second side 3111 b and thecentral axis A of the annular optical component is α, the followingcondition is satisfied: α=3.306 degrees.

The stripe-shaped structures 32 have even height. When a height of eachof the stripe-shaped structures 32 is h, the following condition issatisfied: h=0.04 mm.

When a bottom diameter of the L-shaped annular groove 3111 is φg, adiameter of the outer surface 312 is φo, and a diameter of the innersurface 311 is φi, the following condition is satisfied:(φo−φg)/(φg−φi)=1.07.

4th Embodiment

FIG. 13 is a side cross-sectional view of an annular optical componentaccording to the 4th embodiment of the present disclosure. FIG. 14 andFIG. 15 are enlarged views of the annular optical component in FIG. 13.In this embodiment, an annular optical component includes a main body41, a plurality of stripe-shaped structures 42 and an axial assemblingstructure 43. The annular optical component is able to be disposed in anoptical lens assembly (not shown in the drawings) by the axialassembling structure 43.

The main body 41 includes an inner surface 411, an outer surface 412, anobject-side surface 413 and an image-side surface 414. The inner surface411 surrounds a central axis A of the annular optical component anddefines a central aperture 415. The outer surface 412 is opposite to theinner surface 411. The object-side surface 413 faces toward an objectside of the annular optical component and is connected to the outersurface 412 and the inner surface 411. The image-side surface 414 facestoward an image side of the annular optical component and is connectedto the outer surface 412 and the inner surface 411. The image-sidesurface 414 is opposite to the object-side surface 413. As shown in FIG.13, a cross section of the inner surface 411 of the annular opticalcomponent in side view is zigzag form.

The inner surface 411 includes three L-shaped annular grooves 4111. Oneof the L-shaped annular grooves 4111 closest to the object-side surface313 is interpreted as an object-side L-shaped annular groove, anotherL-shaped annular groove 4111 closest to the image-side surface 314 isinterpreted as an image-side L-shaped annular groove, and the otherL-shaped annular groove 4111 located between the object-side L-shapedannular groove and the image-side L-shaped annular groove is interpretedas a middle L-shaped annular groove. The three L-shaped annular grooves4111 are not overlapped with each other in a direction parallel to thecentral axis A. Each L-shaped annular groove 4111 includes a first side4111 a and a second side 4111 b which are located between theobject-side surface 413 and the image-side surface 414. The first side4111 a and the second side 4111 b are connected to each other, and thestripe-shaped structures 42 are disposed on the second side 4111 b. Anend of each stripe-shaped structure 42 contacts the first side 4111 a ofthe L-shaped annular groove 4111, and the other end of eachstripe-shaped structure 42 faces toward the image side of the annularoptical component. The stripe-shaped structure 42 has a shape similar tothe stripe-shaped structure 12 in the first embodiment, and thus detaildescription for the stripe-shaped structure 42 is omitted hereafter.

A bottom diameter φ2 of the image-side L-shaped annular groove (theL-shaped annular groove 4111 closest to the image-side surface 414) islarger than a bottom diameter φ1 of the object-side L-shaped annulargroove (the L-shaped annular groove 4111 closest to the object-sidesurface 413). A degree of inclination β between the first side 4111 aand the central axis A of the annular optical component is larger than adegree of inclination α between the second side 4111 b and the centralaxis A.

When an angle between the first side 4111 a and the second side 4111 bof the L-shaped annular groove 4111 is θ, the following condition issatisfied: θ=108 degrees.

When a thickness of the annular optical component is t, and a length ofeach of the stripe-shaped structures 42 disposed in the object-sideL-shaped annular groove is d1, the following condition is satisfied:d1/t=0.28.

When the thickness of the annular optical component is t, and a lengthof each of the stripe-shaped structures 42 disposed in the image-sideL-shaped annular groove is d2, the following condition is satisfied:d2/t=0.56.

When the thickness of the annular optical component is t, and a lengthof each of the stripe-shaped structures 42 disposed in the middleL-shaped annular groove is d3, the following condition is satisfied:d3/t=0.28.

When the length of each of the stripe-shaped structures 42 disposed inthe object-side L-shaped annular groove is d1, and the length of each ofthe stripe-shaped structures 42 disposed in the image-side L-shapedannular groove is d2, the following condition is satisfied: d1/d2=0.50.

When a width of the first side 4111 a of the object-side L-shapedannular groove is L1, and a width of the second side 4111 b of theobject-side L-shaped annular groove is L2, the following condition issatisfied: L1/L2=1.60.

When a width of the first side 4111 a of the image-side L-shaped annulargroove is L1, and a width of the second side 4111 b of the image-sideL-shaped annular groove is L2, the following condition is satisfied:L1/L2=0.73.

When a width of the first side 4111 a of the middle L-shaped annulargroove is L1, and a width of the second side 4111 b of the middleL-shaped annular groove is L2, the following condition is satisfied:L1/L2=2.20.

When the degree of inclination between the second side 4111 b and thecentral axis A of the annular optical component is α, the followingcondition is satisfied: α=17.955 degrees.

The stripe-shaped structures 42 have even height. When a height of eachof the stripe-shaped structures 42 is h, the following condition issatisfied: h=0.04 mm.

When a the bottom diameter of the object-side L-shaped annular groove isφ1, a bottom diameter of the image-side L-shaped annular groove is φ2, adiameter of the outer surface 412 is φo, and a diameter of the innersurface 411 is φi, the following condition is satisfied:(φ2−φ1)/(φo−φi)=0.35.

5th Embodiment

FIG. 16 is an enlarged view of an annular optical component according tothe 5th embodiment of the present disclosure. In this embodiment, anannular optical component includes a plurality of stripe-shapedstructures 52, and each stripe-shaped structure 52 includes a taperedportion 521. Compared to the tapered portion 121 of the stripe-shapedstructure 12, including a wedge-shaped tip 1212, in the firstembodiment, a tip 5212 of the tapered portion 521 has arc form.

6th Embodiment

FIG. 17 is an enlarged view of an annular optical component according tothe 6th embodiment of the present disclosure. In this embodiment, anannular optical component includes a plurality of stripe-shapedstructures 62, and each stripe-shaped structure 62 includes a taperedportion 621. A tip 6212 of the tapered portion 621 has a rectangular topsurface.

7th Embodiment

FIG. 18 is an enlarged view of an annular optical component according tothe 7th embodiment of the present disclosure. In this embodiment, anannular optical component includes a plurality of stripe-shapedstructures 72, and each stripe-shaped structure 72 includes a taperedportion 721. Compared to the tapered portion 121 of the stripe-shapedstructure 12, including two smooth inclined surfaces 1213, in the firstembodiment, the tapered portion 721 includes two inclined surfaces 7213which have zigzag form.

The stripe-shaped structures 72 have even height. When a height of eachof the stripe-shaped structures 72 is h, the following condition issatisfied: h=0.08 mm.

8th Embodiment

FIG. 19 is an enlarged view of an annular optical component according tothe 8th embodiment of the present disclosure. In this embodiment, anannular optical component includes a plurality of stripe-shapedstructures 82, and each stripe-shaped structure 82 includes a taperedportion 821. A tip 8212 of the tapered portion 821 has a rectangular topsurface.

The stripe-shaped structures 82 have even height. When a height of eachof the stripe-shaped structures 82 is h, the following condition issatisfied: h=0.08 mm.

9th Embodiment

FIG. 20 is a schematic view of a lens module according to the 9thembodiment of the present disclosure. In this embodiment, a lens module9 includes an annular optical component 90 and an optical lens assembly91.

The annular optical component 90, for example, is the annular opticalcomponent disclosed in the 1st embodiment. The optical lens assembly 91includes a barrel 911, multiple lens elements 912 and an image sensor913. The annular optical component 90 and the lens elements 912 aredisposed ibn the barrel 911. The annular optical component 90 is afixing ring, and the object-side surface 113 of the annular opticalcomponent 90 contacts one of the lens elements 912, such that the axialdistances between every pair of two adjacent lens elements 912 isdetermined by the annular optical component 90. The central aperture 115of the annular optical component 90 is configured to allow light to passthrough the lens module 9.

10th Embodiment

FIG. 21 is a schematic view of a lens module according to the 10thembodiment of the present disclosure. In this embodiment, a lens module10 includes an annular optical component 100 and an optical lensassembly 101. The annular optical component 100, for example, is theannular optical component disclosed in the 4th embodiment. The opticallens assembly 101 includes a barrel 1011, multiple lens elements 1012and an image sensor 1013. The annular optical component 100 and the lenselements 1012 are disposed ibn the barrel 1011.

The annular optical component 100 includes the axial assemblingstructure 43. The annular optical component 100 is disposed on one ofthe lens elements 1012 by the axial assembling structure 43. Moreover,the axial assembling structure 43 is configured to align a central axisof the annular optical component 100 with a center of the lens element1012 which is adjacent to the annular optical component 100.

11th Embodiment

FIG. 22 is a perspective view of an image capturing unit according tothe 11th embodiment of the present disclosure. In this embodiment, animage capturing unit 14 includes the lens module 10 disclosed in the10th embodiment, a driving device 15 and an image stabilizer 16. Thelens module 10 further includes a holder member (their referencenumerals are omitted) for holding the optical lens assembly. The lightconverges in the lens module 10 of the image capturing unit 14 togenerate an image with the driving device 15 utilized for image focusingon the image sensor 1013. The image sensor 1013 (for example, CCD orCMOS), which can feature high photosensitivity and low noise, isprovided for higher image quality.

The driving device 15 can have auto focusing functionality, anddifferent driving configurations can be obtained through the usages ofvoice coil motors (VCM), micro electro-mechanical systems (MEMS),piezoelectric systems, or shape memory alloy materials. The drivingdevice 15 is favorable for obtaining a better imaging position of thelens module 10, so that a clear image of the imaged object can becaptured by the lens module 10 with different object distances.

The image stabilizer 16, such as an accelerometer, a gyro sensor and aHall Effect sensor, is configured to work with the driving device 15 toprovide optical image stabilization (OIS). The driving device 15 workingwith the image stabilizer 16 is favorable for compensating for pan andtilt of the lens module 10 to reduce blurring associated with motionduring exposure. In some cases, the compensation can be provided byelectronic image stabilization (EIS) with image processing software,thereby improving image quality while in motion or low-light conditions.

The present disclosure is not limited to the image capturing unit 14 inFIG. 22. FIG. 23 is a perspective view of an image capturing unitaccording to another embodiment of the present disclosure, wherein theimage capturing unit 14 further includes a flash module 17 activated forlight supplement.

FIG. 24 is a perspective view of an image capturing unit according tostill another embodiment of the present disclosure, wherein the imagecapturing unit 14 further includes a focus assist module 18 configuredto detect an object distance to achieve fast auto focusing. The lightbeam emitted from the focus assist module 18 can be either conventionalinfrared or laser.

12th Embodiment

FIG. 25 is a perspective view of an electronic device according to the12th embodiment of the present disclosure. FIG. 26 is anotherperspective view of the electronic device in FIG. 25. In thisembodiment, an electronic device 20 is a smartphone including the imagecapturing unit 14 disclosed in the 11th embodiment, an image signalprocessor 20 a, an user interface 20 b and an image software processor(not shown in the drawings). The image capturing unit 14 includes a lensmodule, a driving device, an image stabilizer, a flash module and afocus assist module, but the disclosure is not limited thereto.

When a user captures images of an object, the light rays converge in theimage capturing unit 14 to generate an image. The image signal processoris configured to optimize the captured image to improve image quality.The user interface 20 b can be a touch screen or a physical button. Theuser is able to interact with the user interface 20 b and the imagesoftware processor having multiple functions to capture images andcomplete image processing. The image processed by the image softwareprocessor can be displayed on the user interface 20 b.

The smartphone in this embodiment is only exemplary for showing theimage capturing unit 14 of the present disclosure installed in anelectronic device, including a tablet personal computer (FIG. 27) or awearable device (FIG. 28), and the present disclosure is not limitedthereto. The image capturing unit 14 can be optionally applied tooptical systems with a movable focus. Furthermore, the image capturingunit 14, including the annular optical component, features goodcapability in aberration corrections and high image quality, and can beapplied to 3D (three-dimensional) image capturing applications, inproducts such as digital cameras, mobile devices, digital tablets, smarttelevisions, network surveillance devices, dashboard cameras, vehiclebackup cameras, multi-camera devices, image recognition systems, motionsensing input devices, wearable devices and other electronic imagingdevices.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatthe present disclosure shows different data of the differentembodiments; however, the data of the different embodiments are obtainedfrom experiments. The embodiments were chosen and described in order tobest explain the principles of the disclosure and its practicalapplications, to thereby enable others skilled in the art to bestutilize the disclosure and various embodiments with variousmodifications as are suited to the particular use contemplated. Theembodiments depicted above and the appended drawings are exemplary andare not intended to be exhaustive or to limit the scope of the presentdisclosure to the precise forms disclosed. Many modifications andvariations are possible in view of the above teachings.

What is claimed is:
 1. An annular optical component, comprising: aninner surface surrounding a central axis of the annular opticalcomponent, and the inner surface defining a central aperture; an outersurface opposite to the inner surface; an object-side surface facingtoward an object side of the annular optical component, the object-sidesurface being connected to the inner surface and the outer surface; animage-side surface facing toward an image side of the annular opticalcomponent, the image-side surface being connected to the inner surfaceand the outer surface, and the image-side surface being opposite to theobject-side surface; wherein the inner surface comprises a plurality ofL-shaped annular grooves, the annular optical component comprises aplurality of stripe-shaped structures disposed in the L-shaped annulargrooves, and the stripe-shaped structures are arranged along acircumferential direction of the annular optical component; wherein theL-shaped annular grooves comprise an object-side L-shaped annular grooveclosest to the object-side surface and an image-side L-shaped annulargroove closest to the image-side surface, and a bottom diameter of theimage-side L-shaped annular groove is larger than a bottom diameter ofthe object-side L-shaped annular groove; wherein each of the L-shapedannular grooves comprises a first side and a second side connected toeach other, the first side and the second side are located between theobject-side surface and the image-side surface, the stripe-shapedstructures are disposed on either the first side or the second side, anda degree of inclination between the first side and the central axis islarger than a degree of inclination between the second side and thecentral axis.
 2. The annular optical component of claim 1, wherein theannular optical component comprises a main body and the stripe-shapedstructures integral with each other, the main body comprises the innersurface, the outer surface, the object-side surface and the image-sidesurface.
 3. The annular optical component of claim 2, wherein an anglebetween the first side and the second side of each of the L-shapedannular grooves is θ, and the following condition is satisfied: 46degrees<θ<136 degrees.
 4. The annular optical component of claim 3,wherein the L-shaped annular grooves are not overlapped with each otherin a direction parallel to the central axis.
 5. The annular opticalcomponent of claim 3, wherein the angle between the first side and thesecond side of each of the L-shaped annular grooves is θ, and thefollowing condition is satisfied: 64 degrees<θ<116 degrees.
 6. Theannular optical component of claim 5, wherein a thickness of the annularoptical component is t, a length of each of the stripe-shaped structuresis d, and the following condition is satisfied: 0.05<d/t<0.50.
 7. Theannular optical component of claim 5, wherein a number of the L-shapedannular grooves is two, and the two L-shaped annular grooves arerespectively the object-side L-shaped annular groove and the image-sideL-shaped annular groove; wherein a length of each of the stripe-shapedstructures disposed in the object-side L-shaped annular groove is d1, alength of each of the stripe-shaped structures disposed in theimage-side L-shaped annular groove is d2, and the following condition issatisfied: 0.40<d1/d2<2.5.
 8. The annular optical component of claim 2,wherein a width of the first side of each of the L-shaped annulargrooves is L1, a width of the second side of each of the L-shapedannular grooves is L2, and the following condition is satisfied:0.45<L1/L2<2.5.
 9. The annular optical component of claim 2, wherein thedegree of inclination between the second side and the central axis is α,and the following condition is satisfied: 0 degree≤α≤15 degrees.
 10. Theannular optical component of claim 2, wherein each of the stripe-shapedstructures is a stripe and wedge-shaped structure.
 11. The annularoptical component of claim 10, wherein the stripe and wedge-shapedstructure comprises a tapered portion.
 12. The annular optical componentof claim 11, wherein the tapered portion comprises a smooth surface. 13.The annular optical component of claim 2, wherein the stripe-shapedstructures have even height, a height of each of the stripe-shapedstructures is h, and the following condition is satisfied: 0.015mm<h<0.23 mm.
 14. The annular optical component of claim 2, wherein across section of the inner surface is zigzag form.
 15. The annularoptical component of claim 1, wherein the bottom diameter of theobject-side L-shaped annular groove is φ1, the bottom diameter of theimage-side L-shaped annular groove is φ2, a diameter of the outersurface is φo, a diameter of the inner surface is φi, and the followingcondition is satisfied: 0.05<(φ2−φ1)/(φo−φi)<0.55.
 16. A lens module,comprising: the annular optical component of claim 1; and an opticallens assembly, wherein the annular optical component is disposed in theoptical lens assembly.
 17. The lens module of claim 16, wherein theannular optical component further comprises an axial assemblingstructure, the annular optical component is disposed in the optical lensassembly by the axial assembling structure, the optical lens assemblycomprises a lens element adjacent to the annular optical component, andthe axial assembling structure is configured to align the central axisof the annular optical component with a center of the lens element. 18.The lens module of claim 16, wherein the annular optical component is afixing ring configured to determine axial distances between every two oflens elements of the optical lens assembly that are adjacent to eachother, the central aperture of the annular optical component isconfigured to allow light to pass through the lens module, and only oneof the object-side surface and the image-side surface contacts theoptical lens assembly.
 19. An electronic device, comprising: the lensmodule of claim
 16. 20. An annular optical component, comprising: aninner surface surrounding a central axis of the annular opticalcomponent, and the inner surface defining a central aperture; an outersurface opposite to the inner surface; an object-side surface facingtoward an object side of the annular optical component, the object-sidesurface being connected to the inner surface and the outer surface; animage-side surface facing toward an image side of the annular opticalcomponent, the image-side surface being connected to the inner surfaceand the outer surface, and the image-side surface being opposite to theobject-side surface; wherein the inner surface comprises at least oneL-shaped annular groove, the annular optical component comprises aplurality of stripe and wedge-shaped structures disposed in the at leastone L-shaped annular groove, the stripe and wedge-shaped structures arearranged along a circumferential direction of the annular opticalcomponent, and each of the stripe and wedge-shaped structures comprisesa tapered portion; wherein the at least one L-shaped annular groovecomprises a first side and a second side connected to each other, thefirst side and the second side are located between the object-sidesurface and the image-side surface, the stripe and wedge-shapedstructures are disposed on the second side, and a degree of inclinationbetween the first side and the central axis is larger than a degree ofinclination between the second side and the central axis; wherein thedegree of inclination between the second side and the central axis is α,and the following condition is satisfied: 0 degree≤α≤15 degrees.
 21. Theannular optical component of claim 20, wherein an angle between thefirst side and the second side of the at least one L-shaped annulargroove is θ, and the following condition is satisfied: 46 degrees<θ<136degrees.
 22. The annular optical component of claim 20, wherein athickness of the annular optical component is t, a length of each of thestripe and wedge-shaped structures is d, and the following condition issatisfied: 0.05<d/t<0.50.
 23. The annular optical component of claim 20,wherein a width of the first side of the at least one L-shaped annulargroove is L1, a width of the second side of the at least one L-shapedannular groove is L2, and the following condition is satisfied:0.45<L1/L2<2.0.
 24. The annular optical component of claim 20, whereinthe degree of inclination between the second side and the central axisis α, and the following condition is satisfied: 0 degree≤α≤8.0 degrees.25. The annular optical component of claim 20, wherein the bottomdiameter of the at least one L-shaped annular groove is φg, a diameterof the outer surface is φo, a diameter of the inner surface is φi, andthe following condition is satisfied: 0.5<(φo−φg)/(φg−φi)<10.
 26. Theannular optical component of claim 20, wherein the stripe andwedge-shaped structures have even height, and the tapered portion ofeach of the stripe and wedge-shaped structures comprises a smoothsurface.
 27. A lens module, comprising: the annular optical component ofclaim 17; and an optical lens assembly, wherein the annular opticalcomponent is disposed in the optical lens assembly.
 28. The lens moduleof claim 27, wherein the annular optical component further comprises anaxial assembling structure, the annular optical component is disposed inthe optical lens assembly by the axial assembling structure, the opticallens assembly comprises a lens element adjacent to the annular opticalcomponent, and the axial assembling structure is configured to align thecentral axis of the annular optical component with a center of the lenselement.
 29. The lens module of claim 27, wherein the annular opticalcomponent is a fixing ring configured to determine axial distancesbetween every two of lens elements of the optical lens assembly that areadjacent to each other, the central aperture of the annular opticalcomponent is configured to allow light to pass through the lens module,and only one of the object-side surface and the image-side surfacecontacts the optical lens assembly.